L6470HTR datasheet(35/70 Pages) STMICROELECTRONICS

No. de pieza	L6470HTR

Descripción Electrónicos	dSPIN fully integrated microstepping motor driver with motion engine and SPI

PDF	70 Pages

Scroll/Zoom	100%

Fabricante Electrónico	STMICROELECTRONICS [STMicroelectronics]

Página de inicio	http://www.st.com

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35 / 70 page

L6470

Phase current control

Doc ID16737 Rev 4

35/70

7.2

Sensorless stall detection

Depending on motor speed and load angle characteristics, the L6470 offers a motor stall

condition detection using a programmable current comparator.

When a stall event occurs, the respective flag (STEP_LOSS_A or STEP_LOSS_B) is forced

low until a GetStaus command or a system reset occurs (see Section 9.2.20).

7.3

Low speed optimization

When the motor is driven at a very low speed using a small driving voltage, the resulting

phase current can be distorted. As a consequence, the motor position is different from the

ideal one (see Figure 15).

The L6470 implements a low speed optimization in order to remove this effect.

Figure 15.

Current distortion and compensation

The optimization can be enabled setting high the LSPD_OPT bit in the MIN_SPEED register

(see Section 9.1.8) and is active in a speed range from zero to MIN_SPEED. When low

speed optimization is enabled, speed profile minimum speed is forced to zero.

L6470HTR Datasheet(PDF) 35 Page - STMicroelectronics